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2 Sheets-Sheet 1.

(No Model.)

W. A. ANTHONY. I STARTING SWITCH FOR ELECTRIC MOTORS- No. 421,090. Patented Feb. 11,1890.

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(No Model.) 2 Sheets-Sheet 2. W. A. ANTHONY.

STARTING SWITCH FOR ELECTRIC MOTORS. No. 421,090. Patented Feb. 11,1890.

UNITED STATES PATENT OFFICE.

W'ILLIAM A. ANTHONY, OF MANCHESTER, CONNECTICUT, ASSIGNOR TO THE MATHER ELECTRIC COMPANY, OF SAME PLACE.

STARTING-SWITCH FOR ELECTRIC MOTO RS.

SPECIFICATION forming part of Letters Patent No. 421,090, dated February 11, 1890.

Application filed March 21, 1889. Serial No. 304,154- (No model.)

To all 1072 0171 it may concern: plane than the upper surface of the contact- Be it known that I, \VILLIAM A. ANTHONY, point L. The contact-point L is electrically of Manchester, Connecticut, have invented a and directlyconnected with the contact-point new and useful Starting-Switch for Electric M by a conductor which passes from the lower 5 Motors, of which the following description end of one to the lower end of the other under and claim constitute the specification, and the plate Q. The contact-point M is also conwhich is illustrated by the accompanying two nected directly to the other extreme end of sheets of drawings. the field-wire, while the contact-point N is This invention is a starting-switch which connected to the field-wire a little distance I0 is so constructed as to invariably interpose from that extreme end, and the contact-point a large resistance between the main-line con- 0 is connected to the field-wire still farther ductor and the armature of the motor when from that extreme end, and the contact-point the current is first turned on to the arma- P is connected to the field-wire at a point ture, and as to enable that resistance to be still farther inward thereon, so that the re- I 5 easily and gradually lessened by themanager sisiance to the passage of electricity along of the machine as the speed of the armature the field-wire from the point M to the point increases, and acounter-current is generated P is about that through which the normal therein to act as a resistance to the current current for the armature would flow when coming from the main line. the normal difference of potential exists be- 20 Figurel of the drawings is a plan of this tween its terminals and the armature is at switch as located conveniently upon the base rest. of an electric motor, and Fig. 2 is a front ele- Themodeotoperationisasfollows: When the vation of what is shown in Fig. 1. Fig. 3 is a motor is to be started,the armA isturned from plan of this switch, showing the motor and its its dotted position in Fig. 1, over the contact- 2 5 fieldmagnet coils diagrammatically delinepoints M and N, without touching them, and ated in relation to the switch. upon the contact-point L. Thereupon that The letters A and B indicate swinging part of the current which when the armature arms, which constitute the moving parts of is in full motion is designed to pass directly the switch. The arm A is electrically confrom thecontact-point M to the arm B and 0 nected,.through the pivot C, the conductor D, thence into the armature must pass through and the binding-post E, with one branch of that part of the fieldavirewhich is interposed the main line, and the arm B is connected between the contact-points M and P before through the pivot F, the conductor G, and it can reach the arm B and is diminished in the binding-post H, to one of the brushes of volume by the resistance. That diminished 3 5 the armature. The other branch of the main volume of current is sufficient to gradually line is connected to a binding-post on the start the armature, and as the armature inopposite side of the machine, as shown in creases in its speed it acts as a generator to Fig. 3, andthat binding-post is connected to develop a counter-current, and thus dimin- 0 the other armature-brush and to one extreme ishes the amount of current flowing through 40 end of the field-wire. The upward or inward it. Thereupon the arm B may be safely" swing of the arm A is limited b the stop K, turned from the contact-point P to the conbut that arm is not limited in its downward tact-point O and then to the contact-point swing. The swing of the arm B is limited in N, and finally to the contact-point M, so as to 9 5 one direction by the stop J and is limited in cut out all portions of the field-wire from the 5 the other direction by the stop I. armature-circuit.

The letter L indicates .the only contact A. special feature of this invention consists point with which the arm A makes connecin the fact that the arm A cannot be turned tion, while the letters M, N, O, and P indiinto contact with the point L except when 00 cate four contact-points with which the arm the arm B is turned to the position shown in 50 B makes connections, respectively, at difiier- Fig. 1 and out of contact with the points M, ent times, and the upper surfaces of which N, and O and in contact with the point P. are all on the same plane and 011 a lower Therefore this invention renders it impossi- 10 case of their accidental contact.

I claim as my invention- In an electric switch, the combination of the arm A and its contact-point L with the arm 13 and a plurality of contact-points thereof, the upper surfaces of the last-mentioned 15 contact-points being on one plane and the upper surface of the first-mentioned contactpoint being on a higher plane, all combined and operating together substantially as described.

Hartford, Connecticut, March 19, 1889.

WILLIAM A. ANTHONY.

\Vitnesscs:

ALBERT H. WALKER, PHEBIE A. PHELPS. 

